Journal ArticleDOI
Preparation and Characterization of Multiwalled Carbon Nanotube-Supported Platinum for Cathode Catalysts of Direct Methanol Fuel Cells
TLDR
In this paper, a multiwalled carbon nanotube-supported Pt (Pt/MWNT) nanocomposites were prepared by both the aqueous solution reduction of a Pt salt (HCHO reduction) and the reduction of an ion salt in ethylene glycol solution.Abstract:
Multiwalled carbon nanotube-supported Pt (Pt/MWNT) nanocomposites were prepared by both the aqueous solution reduction of a Pt salt (HCHO reduction) and the reduction of a Pt ion salt in ethylene glycol solution. For comparison, a Pt/XC-72 nanocomposite was also prepared by the EG method. The Pt/MWNT catalyst prepared by the EG method has a high and homogeneous dispersion of spherical Pt metal particles with a narrow particle-size distribution. TEM images show that the Pt particle size is in the range of 2-5 nm with a peak at 2.6 nm, which is consistent with 2.5 nm obtained from the XRD broadening calculation. Surface chemical modifications of MWNTs and water content in EG solvent are found to be the key factors in depositing Pt particles on MWNTs. In the case of the direct methanol fuel cell (DMFC) test, the Pt/MWNT catalyst prepared by EG reduction is slightly superior to the catalyst prepared by aqueous reduction and displays significantly higher performance than the Pt/XC-72 catalyst. These differences in catalytic performance between the MWNT-supported or the carbon black XC-72-supported catalysts are attributed to a greater dispersion of the supported Pt particles when the EG method is used, in contrast to aqueous HCHO reduction and to possible unique structural and higher electrical properties when contrasting MWNTs to carbon black XC-72 as a support.read more
Citations
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Journal ArticleDOI
Performance of PEFC Formed by Using Pt-Loaded Activated Carbon under High- and Low-Humidity Conditions
Jun Maruyama,Ikuo Abe +1 more
TL;DR: In this paper, the authors verified the enhancement at fuel cells formed by using conventional activated carbon (Pt/AC) carbon in the cathode catalyst layer and investigated the influence of humidity of the reactant gases.
Journal ArticleDOI
Ordering and segregation in isolated Au–Pd icosahedral nanoclusters and nanowires and the consequences of their encapsulation inside carbon nanotubes
TL;DR: In this paper, the semi-grand canonical ensemble with empirical potentials is used to predict equilibrium ordered structures and segregation properties of small icosahedral Au?Pd nanoclusters and helical nanowire segments over the whole range of compositions at low temperatures.
Book ChapterDOI
Carbon Nanotubes and Their Composites: From Synthesis to Applications
TL;DR: In this paper, the properties of carbon nanotubes (CNTs), synthesis techniques of CNTs, CNT-based composites and their applications in different fields are discussed.
Journal ArticleDOI
Study of titanium adsorption on perfect and defected BC3 nanotubes using density functional theory
TL;DR: In this paper, density functional theory calculations were used to study the Ti adsorption on perfect and defected (4, 0) BC3 nanotubes, considering Stone-Wales and vacancy defects.
DissertationDOI
Oxidação eletroquímica do metanol em eletrólito alcalino por intermédio de eletrocatalisadores PtRuIn/C preparados pelo método de redução por borohidreto de sódio
TL;DR: In this paper, different electrocatalytic systems were synthesized by the sodium borohydride reduction method, in order to be used as an anode in the alkaline direct methanol fuel cell (DMFC).
References
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Journal ArticleDOI
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Journal ArticleDOI
Large-Scale Synthesis of Aligned Carbon Nanotubes
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Journal ArticleDOI
Carbon nanotubule membranes for electrochemical energy storage and production
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